I have both Wisteria and water sprite. And I USED to have peacock fern and those 2 fern plants you got look just like it. The reason why I "used" to have them is because they DIED. They are not aquatic plants. You can remove them and plant them in a regular pot with potting soil or return it to the store :p because it was eventually die if submerged.

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55gallon
Light - 6500K CFL, 23wattsx5 5hr/day
Substrate - Red Mexican Clay, Sphagnum Peat moss, Eco-Complete
Misc- Pressurized CO2, EI Dose KNO3, KH2PO4, CSM-B
Plants -Limnophila Aromatica, Stargrass, Dwarf Hair Grass, Christmas Moss, Baby Tears (HM), Dwarf Baby Tears(HC), Rotala Rotundifolia, Ludwigia Glandulosa, Riccia Fluitans